package com.shy.pet.filter;


import com.shy.pet.common.BaseContext;
import com.shy.pet.common.R;

import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;



import java.io.IOException;

/*检查用户是否完成登录*/
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，可以匹配通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws ServletException, IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls=new String[]{
//          "/employee/login",
//          "/employee/logout",
//          "/backend/**",
//          "/front/**",
//          "/common/**",
//          "/user/sendMsg",//移动端登录发送短信
//          "/user/login"//移动端登录
            "/users/login",
            "/users/register"
        };
        //2.判断本次请求是否需要处理
        boolean check=check(urls,requestURI);
        //3.如果不需要处理则直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4.1判断登录状态，如果已经登录，则直接放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户ID为：{}",request.getSession().getAttribute("employee"));

            Long empId=(Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        //4.2判断登录状态，如果已经登录，则直接放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户ID为：{}",request.getSession().getAttribute("user"));

            Long userId=(Long)request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5.如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
//        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    /*
    * 路径匹配，检查本次请求是否需要放行
    * @param urls
    * @param requestURI
    * @return
    * */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls){
            boolean match=PATH_MATCHER.match(url,requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
